Factors governing the magnetoresistance properties of the electron-doped manganites Ca1-xAxMnO3 (A = Ln, Th)

被引：159

作者：

Maignan, A ^{[1
]}

Martin, C ^{[1
]}

Damay, F ^{[1
]}

Raveau, B ^{[1
]}

机构：

[1] ISMRA, CNRS, UMR 6508, Lab CRISMAT, F-14050 Caen, France

来源：

CHEMISTRY OF MATERIALS | 1998年 / 10卷 / 04期

关键词：

D O I：

10.1021/cm970781b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Magnetotransport properties of the Mn(IV)-rich perovskites Ca(1-x)Ln(x)MnO(3) and Ca1-xThxMnO3 (0 less than or equal to x less than or equal to 0.20) have been systematically investigated. Among the different factors governing their colossal magnetoresistance (CMR), we demonstrate that the electron concentration is the predominant one by comparing the effects of Ln(3+) end Th4+, the optimal x value giving the highest magnetoresistance being twice for the former compared to the latter, in accordance with their respective oxidation states. CMR is linked to the ferromagnetism-antiferromagnetism competition that is maximum for x(opt) = 0.08 in the case of Th, whereas x(opt) increases from x = 0.135 for Pr to x = 0.16 for Ho.

引用

页码：950 / +

页数：6

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